/usr/share/xsessions/pekwm.desktop is in pekwm 0.1.17-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | [Desktop Entry]
Name=Pekwm
Comment=Use this session to run Pekwm as your desktop environment
Keywords=window-manager
Exec=pekwm
Icon=
Type=Application
|